Pencil ferrule



Aug. 1, 1933.

A. L. DAVIS PENCIL FERRULE I Filed May 10, 1933 ATTORNEYS,

Patented Aug. 1, 1933 U T J T ES PATENT- -'oFFI f"'- a .part;

Fig. 8 is a similar View but illustrating the Albert L. Davisrwatertown, Conn, assig'nor v The Waterbury,

Brass Goods Corporation,

.Waterbury, Conn, a Corporation'of Connecti- "out 'ApplicationMayl0,1933. "s mme s-r0355 accompanying drawing wherein satisfactory embodiments of the invention are shown. However, it-wi1l be understood that the invention is ,not limited to the details disclosed but includes all such variations and modifications as fall within the spirit of the invention and the scope of the appended claims. 1

In the drawing: I 1 Fig. 1 is a side elevational view showing the attachment of the invention in place on a pencil; Fig. 2 is an enlarged longitudinal sectional view through the eraserreceiving part of the attachment; A Fig. 3 is a bottom plan view of the part of Fi ;fi i' Fig. 4 is an enlarged side elevational view of the eraser carrying part, the .view being taken at right angles 'to' Fig. 2 and a portion being .30 broken away;

Fig. 5 is a view partly in elevation and partly in section and showing, on an enlarged scale, a 'cap-like pencil receiving part permanently secured to an end of a pencil; s

Fig. 6 is a top plan view ofFig; 5,, a portion being broken away;

Fig. I is an enlarged view partly in section and partly in' elevation and illustrating the first step in assembling the eraser receiving or carrying part on the pencil receiving or carrying relationof-the parts at the completion of the operation of Fig. 7; z

Fig. 9 isa similar view' showing the parts complet'ely'assembled; and,

Fig. 10 'isan enlarged view partly in section and partly in elevation and showing a slightly modifled construction ofpenciL receiving or pencil ,carried part. I Referring in detail to the drawing and at first =more particularly-to Figs. 1 through 8, the improved'attachment is generally'designated 1 5,

, and in Fig. l is shown as applied to any suitable pencil 16. The attachment comprising a twoable for use;

.provided-awall 28. This flange 27 is, formed by c that the flangeis of greatest diameter immedipart ferrule including 'a cap-like pencil receiving part 1'? and an eraser receiving part 18 removably secured to the-cap or pencil receiving part as will later be more fullydescribed. Part 1'1 as shown includes'an end wall 19' and this partis of such diameter that it'may be forced over the-outer end r of a pencil soJastotightly embrace said end and as here disclosed the partis permanently and;

immovably secured to the l pencil. It is immovable onthe pencil owing tothe forced fit-and it may additionally be secured ;to the pencil byp pressing inby punches at spaced points as at 20. The outer or upper end. portion of part 1'7 has its outer peripheral surface:21tapered or inclined wherebythe outen'end-portion 22 is of considerable diameter and is followed bya por -gi v tion of gradually decreasing diameter so that. said outer or upper end portion is in the nature of a.

head having tapering or inclinedside walls. A single lug 23 is carried by the enlarged outer end portion'22 and the lug extends laterally or radially with respect to the part-and is formed by pressing out a portionof the material of the part as clearly shown in Figs. 5 and 6 although itwill be apparent that the lug might be a separate piece secured in' place in any suitable manner.

7 Eraser receivingpart 18 is hollow, being tubular or cylindrical, and this part is preferably of greater diameter than part 17 and is formed with an outer open end and may have beads pressed or 'rolled into its side wall as. shown at 24. An

eraser 25' of a diameter to 'be snugly received in thepart 18 may be 'fltted into saidpart and then further secured as. by; pressing orv punching in portions of the part as at 26. This eraser it will be noted is of substantially'greater diameter-than the pencil and theleraser extends .or projects through the-open 'end of part 18 so as to be avail- The large eraser provides a con: siderable area for use and the eraser-may be of practically any desired size; Y

. At its inner 'end part 18 includes an annular flange 2'7 and inwardly of saidfflange there is forcing the wall 25 inwardly of thepart and the the flange is of a doublethick- Itwill be appreciated that thin flange is therefore formed by foldingof the metal upon itself so that fness' of'material. I or light gauge material is used and that the wall Lthicknessof the flange is notgreater and that the double thickness of materialgreatly strengthens I v the flange. Attention is directed to the fact that the inner peripheral, surface 129 of: the flange is inclined or'tapered, the arrangement being such spaced relation to said notch 30 a recess 31 is formed in theflange this recess beingin the form of a depression in or an opening through the inner layer-of the material forming the flange.

It is preferred that both the parts 17 and 18 be formed of sheet brass or other resilient material I and this is particularly true of the part -18 and the constructing of this part of such material provides a flange 27 which is somewhat yielding or resilient. The diameter of the free or entrance end of'the flange 27 is such with respect to the outer end portion 22 of part1? that said end portion may be forced into the flange by, slightly springing the flange. This assembly may be accomplished by disposing the flange partly overthe outer end portion22 of the part 17 or by partially inserting said end portion in the flange atone side as shownin Fig. '7. The parts should be so positioned that lug 23 and notch 30 are in align- .ment and then on pressure being applied the flange is sprung or forced over the head-like portion 22 so that the relative positions of the parts,

are as shown in Fig. 8. Next, the parts are turned relatively, whereby the notch 30 is carried away from the "lug 23 30 or whereby'saidlug is carried away from the notch, and as, the lug engages the inner surface of the flange there is a cam-like action tending to draw the parts slightly into eccentric relationship whereby the inclined surface'2lof part 17 is forced into tight and overlapping relationship with the inner. inclinedsurface 29 of the flange.

This engagement takes, place particularly at a point opposite the lug 23 as is best shown in Fig. 9. The parts maybe turned rel-' atively until the lug 23 snaps into the recess 31 when the parts will be locked together. Owing to the fact that the inclined surfaces 21 and 29 of the respective parts are forced into tight engagement by the camming action above referred to, the parts will be rigidly connected and the eraser receiving part 18 will not wobble; Further, owing to the fact that the parts have been shifted into aneccentric relationship with the inclined surface of one overlapping. the inclined surface of the other, the parts are securely locked together so that they cannot be pulled apart.

' The-wall 28 may be formed with a slight bow or is formed slightly concavo-convex with the convex surface on the under or outer side; Therefore, when 'theparts are telescoped as shown in Figs. 8 and 9 the wall 28 is slightly sprung upwardlyby the pressing of the parts together. 'While the wall .is thus sprung, the parts are turned relatively and then on the pressure being released the wall tends to returnto normal condition due to its resiliency or spring action, and the parts having been moved into the slightly eccentric relation above mentioned, theoverlapping inclined surfaces further tightly engage as the wall 28 attempts to force the part 17 outof 'the flange. This spring action of the wall'also assists somewhat in maintaining the lug 23 in the recess 31. V r

With the present arrangement it will be noted that but one lug 23 is needed andin manufacture it is cheaper and easier to provide a pencil receiving part or part 17 with one such lug than it is to provide it with two lugs. This part is substantially permanently attached to the pencil and when the part 18 is assembled on the part 17 there is no free relative movement of the parts; and the spring action above referred to. Should the eraser 25 wear down so as to be no longer useful, part 18 may be easily removed by shifting it to bring the notch 30 in alignment with the lug 23 and a new part 18 equipped new eraser may be easily applied. s

r In Fig. 10 is shown a slight modification in which the. end wall of the cap may be bowedor concavo-convex "as indicated at 32 to have the same spring eife'ct as the wall 28 in the eraser receiving member 18. v Having thus setforththe nature of my invention, what I claim is.

1. An article of manufacture including a two part ferrule comprising a pencil receiving part ing part having an annular flange at itsinner end, said pencil receiving'part, including a portion to telescope with said flange, and means whereby on relative rotation of said parts after they havebeen telescoped a surface of one is wedged against a, complementary surface of the 100 other and the parts are rigidly connected.

2. An article of manufacture including-a two part ferrule comprising a pencil receiving part and an eraser receiving part, said eraser receiv- This is caused ;by the camming action anclan eraser receiving part, said eraser receiving part having an annular flange at ,its inner end, said pencil receiving part including aportion to telescope with saidflange, said flange ineluding an inclined peripheral surface, said portion of the pencil receiving part including a complementary inclined peripheral surface, and

means whereby on relative rotation of said parts surfaces are wedged against one another and the parts are rigidly connected.

3. An article of manufacture including a two tion of the pencil including a complementary inclined peripheral surface, and said'lug adapted to engage a surface ofsaidflange and draw said inclined surfaces into engagement to secure the parts together on relative rotation of the parts after they have been telescoped.

4. An article of manufacture including a two part ferrule comprising a pencil receiving part and an eraser receiving part, said parts each having a. free end portion of which one is complementary to the other, said end portion of one of said parts adapted to be sprung over the said camming means whereby said parts are interlocked to rigidly secure them together on relative turning movement ,of the parts after said end."

portions have been sprung one over the other.

5. An article of manufacture includinga two.

part'ferrule comprisingapencil receiving part and an eraser receiving part, said eraser receiving part having an annular flange at its inner end, said flange having anotch opening through I 'end portion of the other :part, and cooperating 5 its inner end, saidipencil receiving part in. its

outer end portion including a portion of increased diameter, a laterally extending lug on the outer end portion of the pencil receiving part, said pencil receiving part adapted to have its outer 110 after they have been telescoped the said inclined 7 A 1mm end portion telescoped into the flange of the;

eraser receiving part on alignment of the lug with the notch in said flange, and said parts adapted thereafter to beturned relatively to space the lug and notch and cause the lug to engage the inner surface of the flange to draw the innersurface of the flange into engagement with the portion of increased, diameter of the pencil receiving part whereby to rigidly secure the eraser receiving part to the pencil receiving part. 6. An article of manufacture including a two part ferrule comprising a capforming pencil receiving part and an eraser receiving part, said eraser receiving part having an annular flange at its innerfend, said flange having its inner peripheral surface inclined whereby the flange is of least diameter adjacent its free end, said flange having a notch opening through its free end, said cap having the outer peripheral surface of its outer end portion inclined wherebyit includes a portion of greater diameter and a portion of gradually decreasingdiameter inwardly of said portion of greater diameter said cap having a laterally extending lug on its portion of greater diameter, said flange of such diameter at itsinner end that the portion of greater diameter of the cap may be forced therethrough on aligning the lug of the cap with the notch in the flange where- 'by to dispose the portionof greater diameter of the cap within the flange to locate theinclined surf ace of one in opposing relation to the inclined surface of the other, and said parts adapted thereafter to be turned one on the other to space the lug and notch and cause the lug to bear against a portion of thejinner inclined surface of the flange and draw a portionof the inclined surface of the flange against a portion of the inclined surface of the cap and thereby secure the eraser wardlyof said portion of greater diameter, said cap having a laterally extending lug-on its portion of greater diameter, saidflange of such diameter at its inner end that the portion of greater diameter of the cap maybe forced therethrough on aligning the lug of the cap with the notch in the flange whereby to dispose the portion of greater diameter of the cap in the flange to locate overlapping the inclinedsurfaceof one in opposing relation.

to the inclined surface of the other, sai d 'partsi adapted thereafter to be turned one onutheother to space "the lug and notch and cause; the lug to bear against a portion of the inner inclined-sure face of the flange and draw' a portion of the inclined surface of the flange against a portion of the inclined surface of the cap whe'rebylto dispose asection of the portion of greaterdiam eter of'the capfo'ver a-sectionxof the inclined? surface of the flange, and means carried by one of said parts andnormally tending to forcethe parts apart whereby when the parts arei-telee scoped and turned relative; to each other their sections will be forced against' one another to secure the parts together: t

8. An article of manufacture including a two part ferrule comprising'apencil receiving part and an eraser receiving part, said eraser-receiv ing part having an annular flange at its inner end, a bowed springwall in said part inwardly i of saidiflange, saidflange having .itsfinner peripheral surface inclined whereby the flange is of least diameter adjacent its free end,s'aid flange having a notch opening through its free-end,

said pencil receiving part having the'outer pe'-. ripheral'surface of its outer end portion inclined whereby it includes a portion'of greater diameter and a portion of gradually decreasing diameter inwardly of said portionof greater diameter, said pencil receiving part having a laterally extending lug on its portion of greater diameter, said flange of such diamete'rat its, inner end that the. p'or-i' tion of greater diameter of the pencil receiving partmay be forced therethrough on aligning, thelug of the pencil receiving part with the, 'notch' in the flange whereby to dispose theportion of greater diameter of the pencil receiving part inthe flange tolocate the inclined surface 7 u of one in opposing relation to the inclined stir-- face of the other,said parts, adapted thereafter to be turnedoneon the other to space the lug and notch and. cause thelug to bear against a portion ofthe inner inclined surface of the flange and force aportion of the inclined'surfaceiof. the flange against a portion of the inclined sur face of the pencil receiving part whereby to dis-5 pose a section of the portion of greater diameter of the pencil receiving part over a section of the inclined surface 'of, the flange,,and said pencil receiving part adapted on entering the flangeto engage and spring said bowedwall whereby on 1 the parts being released after being turned relatively the spring wall will tend to return to normal position andwill force the overlappingsections against "one another togsecure'theparts together. v v

, ALBERT L. DAVIS; 

